Hugh sangstee



H. & J. SANGSTER.

- Street Lamp.

Patented Jarfy a4, 1851.

UNITED STATES PATENT OFFICE.

HUGH SANGSTER AND JAMESSANGSTER, OF BUFFALO, NEW YORK.

REFLECTOR FOR STREET-LAMPS.

Specification of Letters Patent No. 7,904, dated January 14, 1851.

sponding with the number of faces of the reflector; and in making each face of the reflector of a number of concave rings concentric in outline as hereinafter described and shown.

Figure 1 is a side elevation of the lamp showing the construction and arrangement of the parts, the reflector being shown in vertical section. Fig. 2 shows one of the faces of the reflector, and Figs. 3 and 4 show,

horizontal sections of the triple and quadruple reflectors, all the sections being made by a plane passing through the center of each face. i

A, (Fig 1) is the upper part of thelamp post, and B, is the outside frame which are made in the usual form.

C is a vertical section of the reflector which may be made of tin plate, or tinned copper or any other substance which can be formed with facility and is otherwise suit- 0 able for reflectors.

The general form of the faces of this reflector is a concave, but-the concavity of the radiating surface, and consequently the t V effect of the light is increased by making the faces in concave rings in the manner shown in the drawings, to which reference is had for the form of the faces of the reflector. This form of reflector secures nearly or quite all the advantages peculiar to reflectors with concave indentations in the face, while at the same time they can be made much cheaper and can be cleaned'with greater facility by turning them in a lat-he.

The faces of the reflector are fastened to each other by a metallic rim and there flector is supported on a rod n, and the burners D, D, are so made as to bring the lightlof each opposite the center of that face of the reflector to which it belongs.

What we claim as our invention and desire to secure by Letters Patent is Making the faces of the reflector in concave rings substantially in the manner and for the purposes herein set forth.

HUGH SANGSTER. JAMES sANesTER.

Witnesses THOMAS P. How, IIENRYF. VVILLsoN. 

